Lithographically Patterned Conductive Hydrogels for Stretchable Electronics
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Solution Overview
Problem
Challenges exist in miniaturizing electrically conductive hydrogels for encapsulated electronics with small-scale feature size and stretchability, particularly due to issues with chemical resistance and the inability to be photo-patterned, which hinder their application in stretchable electronics.
Innovation Solution
A photo-curable composition is developed, comprising a fluorinated monomer with cross-linkable functional groups and a photoinitiator, which is used to form an electrically conductive hydrogel by combining an electrically conductive polymer with an ionic liquid and removing the ionic liquid to create a conductive hydrogel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If elastomers are used as dielectric materials for stretchable electronics, then stretchability is improved, but chemical resistance deteriorates preventing patterning of semiconducting polymers
Solution Approach 1:
The patent introduces a photo-curable composition as an intermediary layer between the elastomer dielectric and the semiconducting polymer. This composition contains a fluorinated monomer and photoinitiator that forms a protective barrier upon UV exposure, enabling chemical resistance during patterning while maintaining the stretchability of the underlying elastomer.
Solution Approach 2:
The patent changes the chemical parameters of the dielectric layer by using a fluorinated monomer system that undergoes photopolymerization. This parameter change creates a chemically resistant surface layer through cross-linking, allowing patterning processes to proceed without degrading the elastomer substrate.
2Duration of action of moving object
If elastomers are used as dielectric materials, then stretchability is improved, but photo-patterning capability deteriorates
Solution Approach 1:
The photo-curable composition serves as a mediator that enables photolithography processes on stretchable devices. The fluorinated monomer system provides a surface that can be selectively exposed to UV light, allowing precise patterning of conductive elements while the elastomer remains stretched and functional.
Solution Approach 2:
The patent replaces traditional mechanical patterning methods with optical/photographic patterning using UV light. The photo-curable composition absorbs UV energy to initiate cross-linking, creating patterns without mechanical contact, thereby preserving the stretchability and integrity of the elastomer substrate.
3Manufacturing precision
If electrically conductive hydrogel is miniaturized for encapsulated electronics, then feature size is reduced, but stretchability and chemical resistance deteriorate
Solution Approach 1:
The patent segments the device structure into distinct functional layers: the elastomer dielectric layer providing stretchability, the photo-curable composition layer providing chemical resistance and patterning capability, and the electrically conductive hydrogel layer providing electrical functionality. This segmentation allows each layer to be optimized for its specific function without compromising the others.
Solution Approach 2:
The patent creates a composite structure combining elastomer, fluorinated photo-curable composition, and electrically conductive hydrogel. This composite material system integrates the stretchability of elastomers with the chemical resistance and patterning capability of the fluorinated polymer, while maintaining the electrical conductivity of the hydrogel even at miniaturized feature sizes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resulting hydrogel exhibits high electrical conductivity and stretchability, suitable for applications in implantable medical devices, wearable electronics, and soft electronic devices, with improved patterning capabilities and stability in aqueous environments.
Implementation Method 1
a photo-curable composition includes: a fluorinated monomer including cross-linkable functional groups; and a photoinitiator
Implementation Method 2
combining an electrically conductive polymer with an ionic liquid to form an ion gel
Implementation Method 3
at least partially removing the ionic liquid in the ion gel to form an electrically conductive hydrogel
Data Source
AI summary
A manufacturing method for forming a patterned layer includes applying a photo-curable composition to a surface of a substrate, and selectively curing the photo-curable composition to form the patterned layer on the surface, wherein the photo-curable composition includes a perfluorinated monomer including cross-linkable functional groups; and a photoinitiator.